Defensive publication



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16. 1969, 869 0.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification. including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Oflice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED DECEMBER 1, 1970 PROCESS FOR INCREASING THE RETENTION OF PAPERFINES AND ADDITIVES BY USING A LINEAR, WATER-DISSIPATABLE, MELTABLEPOLYESTER PREPARED FROM MIXED CAR- BOXYLIC ACIDS AND A GLYCOL Charles H.Coney, 2008 Canterbury Road 37660, and

Donald A. Maxwell, Rte. 11 37663, both of Kingsport, Tenn.

Filed May 13, 1970, Ser. No. 36,995 Int. Cl. D21h 3/60 US. Cl. 162168 NoDrawing. 27 Pages Specification A linear, water-dissipatable, meltablepolyester having an inherent viscosity within the range of about 0.1 toabout 0.8 prepared from mixed carboxylic acids (especiallysodiosulfoisophthalic acid) and a glycol (especially diethylene glycol)is added as a retention aid to a water slurry or suspension ofpaper-forming fibers prior to the use of the slurry in a paper-makingoperation. Such a polymer functions through a flocculating action tocause paper fines (for example, small particles of paper-forming fibersand minute particles of additives such as pigments, resinous sizes,binders and the like) to form larger particulate aggregates of such sizethat they are enmeshed in, and entrapped by, the paper-forming fibers atthe screening or sheet-forming step in which water is removed from theslurry. This expedient makes possible retention of the paper fines inthe ultimate product and by removing them from the white water, reducesthe amount of treatment necessary to render the water suitable for reusein making up new slurries of raw stock.

